# US 12,110,399 B2 · Photocurable inkjet printing ink composition

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- Number: US 12,110,399 B2
- Document ID: US12110399B2
- Status: Granted
- Kind: B2
- Application number: 17/042,051
- Filed: 2019-03-19
- Published: 2021-01-28
- Granted: 2024-10-08
- Earliest claimed: 2018-03-29
- Assignees: Sakata Inx Corporation
- Applicants: Sakata Inx Corporation
- Inventors: Okinori Nakashima; Takuya Myose; Kazuhiro Fuke; Ryoichi Nitta
- Web page: https://patentgrep.com/patent/US12110399B2

## CPC

- C09D 11/101: Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
- C08F 2/50: with sensitising agents
- C08F 226/06: by a heterocyclic ring containing nitrogen
- C08F 236/20: unconjugated
- C08F 236/22: the radical having three or more carbon-to-carbon double bonds
- C09D 11/106: containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C09D 11/322: Pigment inks
- C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

An object is to obtain a photocurable inkjet printing ink composition that demonstrates excellent preservation stability and discharge property, while also presenting curability under ultraviolet light from a light-emitting diode (LED) light source, as well as good adhesion, flexibility and tackiness. As a solution, a photocurable inkjet printing ink composition containing photopolymerizable compounds and photopolymerization initiator is provided, wherein the photocurable inkjet printing ink composition satisfies A to D: A. 2-(allyloxy methyl) methyl acrylate is contained by 5 to 40 percent by mass in all photopolymerizable compounds; B. multifunctional monomers and/or multifunctional oligomers of 0° C. or lower in glass transition temperature are contained by 5 to 20 percent by mass in all photopolymerizable compounds; C. amino group and/or amide group-containing monomers and/or oligomers are contained; and D. the ink composition has a viscosity of 30 mPa·s or lower at 25° C.

## Claims

### Claim 1

A photocurable inkjet printing ink composition containing photopolymerizable compounds and a photopolymerization initiator, the photocurable inkjet printing ink composition satisfying A to D:
A. 2-(allyloxy methyl) methyl acrylate is contained by 5 to 40 percent by mass in all photopolymerizable compounds;
B. multifunctional monomers and/or multifunctional oligomers of 0° C. or lower in glass transition temperature are contained by 5 to 20 percent by mass in all photopolymerizable compounds;
C. amino group and/or amide group-containing monomers and oligomers are contained, wherein a combination of (i) an acrylated amine compound having two photopolymerizable functional groups and two amino groups in its molecule and (ii) acryloyl morpholine and/or N-vinyl caprolactam is used; and
D. the ink composition has a viscosity of 30 mPa·s or lower at 25° C.,
wherein the amino group and/or amide group-containing monomers and oligomers are contained by 5 to 45 percent by mass in all photopolymerizable compounds.

### Claim 2 (depends on 1)

The photocurable inkjet printing ink composition according to claim 1, which contains multifunctional monomers and/or multifunctional oligomers of 40° C. or higher in glass transition temperature by 10 percent by mass or lower in all photopolymerizable compounds.

### Claim 3 (depends on 1)

The photocurable inkjet printing ink composition according to claim 1, which contains a colorant.

### Claim 4 (depends on 2)

The photocurable inkjet printing ink composition according to claim 2, which contains a colorant.

### Claim 5 (depends on 1)

The photocurable inkjet printing ink composition according to claim 1, which contains no non-curable resin.

### Claim 6 (depends on 1)

The photocurable inkjet printing ink composition according to claim 1, which contains neither multifunctional monomers nor multifunctional oligomers of 40° C. or higher in glass transition temperature.